Here we go
1)install Patch
2)create a folder named scrims (lower case) on the root of your Pre's usb drive.
3)Use the same pic you are using for your wallpaper and place it in your scrims folder and name it statusbar-scrim.png

This will not change if you use switcharoo wallpaper changer.

You can save extras in the wallpapers folder in a folder named .scrims (dont forget the . or they will show up in the photos app) and change them whenever you want using internals.

scrims folder on the usb drive for the statusbar-scrim.png you are currently using, Extras to be saved in wallpapers/.scrims for changing wallpapers.... the .scrim folder is hidden from showing when you open photos app.